Ok, but not Great
December 12, 2014
I bought this kit for the purpose of polishing out slight windshield wiper scratches on the passenger side of a 1993 BMW 325 with ~130k mile, and what appeared to be slight random scratches in a 2013 Audi A4 that were probably caused by poor washing habits or wiping a dusty windshield with a dry cloth.
I tried using the products as directed by the manufacturer, using a battery powered drill, and a small "Off" brand pump spray atomizer bottle filled with water to keep the compound wet. I found it difficult and hard on the wrists to hold the pad properly on the windshield and move it as instructed. A drill or buffer with an angle drive would be much easier on the wrists and much easier to control.
I succeeded in significantly reducing the windshield wiper scratch pattern on the BMW which fortunately for me was located such that I could more easily reach and control the power drill during buffing. But on the Audi, it appeared that I created as many scratches as I removed, and do not understand why or how that could have occurred since I thoroughly pre-cleaned its windshield with soap and water, then alcohol and water solution multiple times prior to using this kit.
After buffing the scratches, and again thoroughly cleaning the windshield[s] with water/alcohol, I applied the glass sealant as per the directions. Twice.
When I later drove these cars in rain, I was not impressed. Rain-X has worked much better for me, and that was without previously polishing/buffing and washing the windshields with water/alcohol solution. The Glass Sealant is not worth its price.
Also, anyone having a vehicle with a rain sensing wiper system should be cautious when using any of these glass sealant/water repellent products. They may interfere with the rain sensing system. Audi specifically warns against their use in its owner's manuals, but they did not seem to interfere when applied to my car's windshield. Nor did Rain-Ex.
Pros:Somewhat effective at removing minor windshield scratches, e.g. from wipers.
Cons:Hard to use as directed, unless you have an angle drive power drill or buffer.